PDF malware analysis — malicious · 858b563f91c83c6b

MALICIOUS

PDF

39.7 KB

MD5: 03aaa54632b5d1290413776099fea374 SHA-1: 23d294093cdcebb9d292b8d56110e525fdaf2700 SHA-256: 858b563f91c83c6b6df3e738be95d03388560d2d18174540713bfa581cd864ff

226 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript and leverages the CVE-2007-5659 vulnerability through the `collab.collectEmailInfo` function. This indicates an attempt to execute malicious code upon opening the document. The presence of deobfuscated JavaScript streams suggests the script is designed to download and execute further payloads or perform other malicious actions. The ClamAV detection further supports the malicious nature of the file.

Heuristics 8

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
ClamAV: Pdf.Exploit.Agent-36063 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36063
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `eb39e2de4dbbc100de6d3e30aa43ff78fa075618862ba1ebba5151ea3a3b848d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A4	273 bytes
`annotation_subject_callee_hex_stage_000.js` `38ce28ecd0c07ab20973144421448f5a76150bc3885cf375be56a73ea5c02094`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x151	5481 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `6aa00291a3f6fae866a8090e66a9820efa7dc5d2f9490565010110ad5758b316`	deobfuscated-js	PDF JavaScript deobfuscation pass	271781 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`u3d_00_off00003297.bin` `db166b7bf539ceb527a321927dc7262838bbe91b146a4aa26884d46ee5696f20`	pdf-3d-stream	PDF U3D 3D stream at offset 0x3297	27443 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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